. Author manuscript; available in PMC: 2009 Mar 9.

Published in final edited form as: J Clin Epidemiol. 2008 Feb 14;61(6):580–587. doi: 10.1016/j.jclinepi.2007.08.001

Table 2.

C-Statistics Rating Model Performance for One-Year Mortality Following Hip Fracture among Medicare Beneficiaries

	Adjustment Instruments
		Charlson
Implementation Strategy	CCS	Components	Index	Iezzoni

MedPar (index+pre-period) + Part B (pre-period)	0.76	0.72^*,^‡	0.71^*,^‡	0.73^*,^‡
MedPar (pre-period) + Part B (pre-period)	0.72^*,^§	0.69^*,^‡,^§	0.69^*,^‡,^§	0.70^*,^‡,^§
MedPar (index) + Part B (pre-period)	0.76	0.71^*,^‡	0.70^*,^‡	0.72^*,^‡
Part B (pre-period)	0.71^*,^§	0.68^*,^‡,^§	0.68^*,^‡,^§	0.70^*,^‡,^§
MedPar (index + pre-period)	0.76	0.71^*,^‡	0.71^*,^‡	0.72^*,^‡
MedPar (pre-period)	0.69^*,^§	0.68^*,^‡,^§	0.68^*,^‡,^§	0.68^*,^‡,^§
MedPar (index)	0.75^*,^§	0.70^*,^‡,^§	0.69^*,^‡,^§	0.71^*,^‡,^§

Legend:

Models are arranged from most to least complex based on data source and time frame to which each was applied. All models adjusted for age, sex, and race differences.

Comparison 1 - denotes statistical difference (p < 0.05) from the reference standard model:

CCS - MedPar (index + pre-period) + Part B (pre-period).

^‡

Comparison 2 - denotes statistical difference (p < 0.05) from the model with the greatest number of parameters (CCS) across risk-adjustment strategies for the same data source and time-frame combination.

^§

Comparison 3 - denotes statistical difference (p < 0.05) from the model with the broadest data source and time-frame combination [MedPar (index + pre-period) + Par B (pre-period)] within each risk-adjustment strategy.